Medicine that is Focused on YOU!
At Duncan Integrative Medicine, we blend the best of traditional and functional medicine to offer you personalized, proactive healthcare. Located in Olympia, WA, our practice is dedicated to preventing and treating chronic diseases through a holistic, root-cause approach.
Dr. Thomas Duncan, with over 27 years of experience, leads our team with a commitment to compassionate, patient-centered care. Whether you’re looking to manage your weight, prevent cardiovascular disease, or optimize your overall health, we’re here to support you every step of the way.
Functional Medicine | MD | Men’s Health
I Became My Own First Patient.
Every life reaches a threshold.
A moment when you look in the mirror and realize that the path you’re on is no longer the one you want to follow.
Mine came in 2021.
After years of seeing more than 40 patients every day, I had built a successful medical practice. Yet while I was helping thousands of people improve their health, I had quietly stopped taking care of my own.
The physician teaching health had become unhealthy.
That realization changed everything.
I made a commitment that I would never ask another patient to do something I wasn’t willing to do myself.
I became my own first patient.
I applied the same principles I had spent my career teaching—nutrition, strength training, restorative sleep, metabolic optimization, hormone balance, evidence-based medicine, and daily habits that create lasting change.
The result wasn’t simply losing more than 50 pounds.
I regained my energy.
My confidence.
My purpose.
Most importantly, I rediscovered what it feels like to wake up excited about life again.
That transformation didn’t just change my health.
It completely transformed the way I practice medicine.
I realized that the greatest limitation in modern healthcare isn’t knowledge.
It’s time.
Real transformation doesn’t happen in rushed office visits. It happens when a physician has the time to truly listen, understand your story, identify the root causes holding you back, and walk beside you every step of the journey.
That’s why I left the traditional high-volume model and created Duncan Integrative Medicine.
Not because I wanted to see fewer patients.
Because I wanted to know each patient better.
Today, I combine the best of traditional medicine, functional medicine, metabolic optimization, longevity science, hormone optimization, advanced diagnostics, and behavioral psychology into one personalized strategy designed around you.
Because information isn’t the problem.
Most people already know what they should do.
The challenge is transforming knowledge into lasting action.
That is where my passion lies.
My mission isn’t simply to help you lose weight, optimize your hormones, lower your cholesterol, or prevent disease.
My mission is to help you become the healthiest, strongest, and most vibrant version of yourself—so you can live longer, live better, and fully experience the life you’ve been given.
I’ve crossed my threshold.
Now I’d be honored to help you cross yours.
Are you ready to become the strongest, healthiest version of yourself?
Functional Medicine | ARNP | women’s Health
Amanda Essert, MSN, ARNP is a board-certified Family Nurse Practitioner with more than 20 years of nursing experience, including 12 years in emergency medicine. Growing up in Tenino, she is a longtime Northwest native with a deep-rooted connection to the community she serves. It was her own life-changing autoimmune diagnosis that inspired the journey to seek a better understanding of health and longevity.
Amanda’s personal experience with polymyositis, a rare autoimmune disease, changed the way she views medicine. Navigating a complex condition firsthand taught her what it feels like to long for real answers and the need for a provider who searches deeper, looking beyond just symptoms. That experience sparked her passion for functional and root-cause medicine, and it continues to shape the compassionate, holistic care she provides today.
Amanda believes healthcare is more than treating illness. It is helping people build healthier, stronger lives through education, personalized care, and a proactive approach to wellness. Her practice centers on a holistic view focusing on metabolic health, hormone management, and disease prevention. Amanda’s mission is simple: help every patient gain more healthy years, more energy, and more freedom to live life on their own terms.
We view the body as an interconnected system, addressing the root causes of illness rather than just treating symptoms. Our care integrates the best of conventional medicine with evidence-based alternative therapies.
Every patient is unique, and so is their treatment. We tailor our approaches to meet individual health needs, considering genetics, lifestyle, and environmental factors to optimize well-being.
We believe in empowering our patients through education and collaboration. Our team works closely with you, providing the knowledge and tools necessary to take an active role in your health journey.
Prevention is key to lasting wellness. We prioritize early intervention and lifestyle modifications to prevent chronic diseases, ensuring a healthier future for our patients.
We are dedicated to fostering a caring and supportive environment. Our team listens with empathy, ensuring that every patient feels understood and valued throughout their healing journey.
We are committed to promoting long-term health through sustainable practices. By focusing on lifestyle changes and natural therapies, we aim to create lasting wellness that supports both the individual and the community.
Convenient & Communicative
Your time is valuable, too. Our care team schedules appointments that work with YOUR schedule.
Personalized Attention
Healthcare how it should be. We listen, hear you, and give you a personalized plan based on your health needs.
Healthcare Advocacy
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